How to view comments in mysql tables: 1. View the comments of all tables through the "information_schema.TABLES" statement; 2. Query the comments of all tables and fields through the "information_schema. TABLES a LEFT JOIN..." statement Notes etc.
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Mysql View table comments or field comments
View the comments of all tables
SELECT table_name 表名, table_comment 表说明 FROM information_schema.TABLES WHERE table_schema = '数据库名' ORDER BY table_name
Query the comments of all tables and fields
SELECT a.table_name 表名, a.table_comment 表说明, b.COLUMN_NAME 字段名, b.column_comment 字段说明, b.column_type 字段类型, b.column_key 约束 FROM information_schema. TABLES a LEFT JOIN information_schema. COLUMNS b ON a.table_name = b.TABLE_NAME WHERE a.table_schema = '数据库名' ORDER BY a.table_name
Query the comments of all fields of a table
select COLUMN_NAME 字段名, column_comment 字段说明, column_type 字段类型, column_key 约束 from information_schema.columns where table_schema = '数据库名' and table_name = '表名' ;
or
show full columns from 表名;
View DDL generated by the table
Note that the table name does not include single quotes
show create table 表名;
Create a new table and add comments for tables and fields
create table t_user( ID INT(19) primary key auto_increment comment '主键', NAME VARCHAR(300) comment '姓名', CREATE_TIME date comment '创建时间' )comment = '用户信息表';
Modify comments for tables/fields
Modify table comments
alter table t_user comment = '修改后的表注释信息(用户信息表)';
Modify field comments
alter table t_user modify column id int comment '主键ID';
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